js.prompto.expression.TernaryExpression.js Maven / Gradle / Ivy

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var BooleanType = require("../type/BooleanType").BooleanType;
var Dialect = require("../parser/Dialect").Dialect;
var Bool = require("../value/Bool").Bool;

function TernaryExpression(condition, ifTrue, ifFalse) {
    this.condition = condition;
    this.ifTrue = ifTrue;
    this.ifFalse = ifFalse;
    return this;
}

TernaryExpression.prototype.toDialect = function(writer) {
    if(writer.dialect==Dialect.O) {
        this.condition.toDialect(writer);
        writer.append(" ? ");
        this.ifTrue.toDialect(writer);
        writer.append(" : ");
        this.ifFalse.toDialect(writer);
    } else {
        this.ifTrue.toDialect(writer);
        writer.append(" if ");
        this.condition.toDialect(writer);
        writer.append(" else ");
        this.ifFalse.toDialect(writer);
    }
};

TernaryExpression.prototype.check = function(context) {
    var type = this.condition.check(context);
    if(!(type instanceof BooleanType))
        throw new SyntaxError("Cannot test condition on " +  type.getName() );
    var trueType = this.ifTrue.check(context);
    // Type falseType = this.ifFalse.check(context);
    // TODO check compatibility
    return trueType;
};

TernaryExpression.prototype.interpret = function(context) {
    var test = this.condition.interpret(context);
    if(test == Bool.TRUE)
        return this.ifTrue.interpret(context);
    else
        return this.ifFalse.interpret(context);
};

exports.TernaryExpression = TernaryExpression;